Inheritance: TransientNode
        public TransientNode Using(Func<BuildInstance, Stream, Stream> processor)
        {
            var node = new ProcessorNode(processor) { OutputNode = this };
            InputNode = node;

            return node;
        }
        public TransientNode Using(Func<BuildInstance, IEnumerable<object>, object> processor)
        {
            var node = new ProcessorNode(processor) { OutputNode = this };
            InputNode = node;

            return node;
        }